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Sur S, Xu Y, Li S, Gong SS, Nevidomskyy AH. Field-Induced Non-BEC Transitions in Frustrated Magnets. PHYSICAL REVIEW LETTERS 2024; 132:066701. [PMID: 38394558 DOI: 10.1103/physrevlett.132.066701] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 12/12/2023] [Accepted: 01/04/2024] [Indexed: 02/25/2024]
Abstract
Frustrated spin systems have traditionally proven challenging to understand, owing to a scarcity of controlled methods for their analyses. By contrast, under strong magnetic fields, certain aspects of spin systems admit simpler and universal description in terms of hardcore bosons. The bosonic formalism is anchored by the phenomenon of Bose-Einstein condensation (BEC), which has helped explain the behaviors of a wide range of magnetic compounds under applied magnetic fields. Here, we focus on the interplay between frustration and externally applied magnetic field to identify instances where the BEC paradigm is no longer applicable. As a representative example, we consider the antiferromagnetic J_{1}-J_{2}-J_{3} model on the square lattice in the presence of a uniform external magnetic field, and demonstrate that the frustration-driven suppression of the Néel order leads to a Lifshitz transition for the hardcore bosons. In the vicinity of the Lifshitz point, the physics becomes unmoored from the BEC paradigm, and the behavior of the system, both at and below the saturation field, is controlled by a Lifshitz multicritical point. We obtain the resultant universal scaling behaviors, and provide strong evidence for the existence of a frustration and magnetic-field driven correlated bosonic liquid state along the entire phase boundary separating the Néel phase from other magnetically ordered states.
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Affiliation(s)
- Shouvik Sur
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Yi Xu
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Shuyi Li
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Shou-Shu Gong
- School of Physical Sciences, Great Bay University, Dongguan 523000, China, and Great Bay Institute for Advanced Study, Dongguan 523000, China
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Blosser D, Bhartiya VK, Voneshen DJ, Zheludev A. z=2 Quantum Critical Dynamics in a Spin Ladder. PHYSICAL REVIEW LETTERS 2018; 121:247201. [PMID: 30608730 DOI: 10.1103/physrevlett.121.247201] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Indexed: 06/09/2023]
Abstract
By means of inelastic neutron scattering we investigate finite temperature dynamics in the quantum spin ladder compound (C_{5}H_{12}N)_{2}CuBr_{4} (BPCB) near the magnetic field induced quantum critical point with dynamical exponent z=2. We observe universal finite-temperature scaling of the transverse local dynamic structure factor in spectacular quantitative agreement with long-standing theoretical predictions. At the same time, already at rather low temperatures, we observe strong nonuniversal longitudinal fluctuations. To separate the two, we make use of an intrinsic leg-exchange symmetry of the spin ladder. Complementary measurements of specific heat also reveal striking scaling behavior near the quantum critical point.
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Affiliation(s)
- D Blosser
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - V K Bhartiya
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
| | - D J Voneshen
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, United Kingdom
| | - A Zheludev
- Laboratory for Solid State Physics, ETH Zürich, 8093 Zürich, Switzerland
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Matsumoto Y, Nakatsuji S, Kuga K, Karaki Y, Horie N, Shimura Y, Sakakibara T, Nevidomskyy AH, Coleman P. Quantum Criticality Without Tuning in the Mixed Valence Compound β-YbAlB
4. Science 2011; 331:316-9. [PMID: 21252341 DOI: 10.1126/science.1197531] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Yosuke Matsumoto
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Satoru Nakatsuji
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Kentaro Kuga
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Yoshitomo Karaki
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Naoki Horie
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Yasuyuki Shimura
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Toshiro Sakakibara
- Institute for Solid State Physics, University of Tokyo, Kashiwa 277-8581, Japan
| | - Andriy H. Nevidomskyy
- Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
- Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA
| | - Piers Coleman
- Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854, USA
- Department of Physics, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK
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Abstract
There are two main theoretical descriptions of antiferromagnets. The first arises from atomic physics, which predicts that atoms with unpaired electrons develop magnetic moments. In a solid, the coupling between moments on nearby ions then yields antiferromagnetic order at low temperatures. The second description, based on the physics of electron fluids or 'Fermi liquids' states that Coulomb interactions can drive the fluid to adopt a more stable configuration by developing a spin density wave. It is at present unknown which view is appropriate at a 'quantum critical point' where the antiferromagnetic transition temperature vanishes. Here we report neutron scattering and bulk magnetometry measurements of the metal CeCu(6-x)Au(x), which allow us to discriminate between the two models. We find evidence for an atomically local contribution to the magnetic correlations which develops at the critical gold concentration (x(c) = 0.1), corresponding to a magnetic ordering temperature of zero. This contribution implies that a Fermi-liquid-destroying spin-localizing transition, unanticipated from the spin density wave description, coincides with the antiferromagnetic quantum critical point.
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Kirkpatrick TR, Belitz D. Quantum critical behavior of disordered itinerant ferromagnets. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 53:14364-14376. [PMID: 9983235 DOI: 10.1103/physrevb.53.14364] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Belitz D, Kirkpatrick TR. Anderson-Mott transition as a quantum-glass problem. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:13922-13935. [PMID: 9980608 DOI: 10.1103/physrevb.52.13922] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Read N, Sachdev S. Continuum quantum ferromagnets at finite temperature and the quantum Hall effect. PHYSICAL REVIEW LETTERS 1995; 75:3509-3512. [PMID: 10059604 DOI: 10.1103/physrevlett.75.3509] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
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Sachdev S, Read N, Oppermann R. Quantum field theory of metallic spin glasses. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:10286-10294. [PMID: 9980079 DOI: 10.1103/physrevb.52.10286] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Read N, Sachdev S, Ye J. Landau theory of quantum spin glasses of rotors and Ising spins. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 52:384-410. [PMID: 9979617 DOI: 10.1103/physrevb.52.384] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Ioffe LB, Millis AJ. Critical behavior of the uniform susceptibility of a Fermi liquid near an antiferromagnetic transition with dynamic exponent z=2. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:16151-16158. [PMID: 9978597 DOI: 10.1103/physrevb.51.16151] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Sachdev S, Chubukov AV, Sokol A. Crossover and scaling in a nearly antiferromagnetic Fermi liquid in two dimensions. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:14874-14891. [PMID: 9978439 DOI: 10.1103/physrevb.51.14874] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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Zülicke U, Millis AJ. Specific heat of a three-dimensional metal near a zero-temperature magnetic phase transition with dynamic exponent z=2, 3, or 4. PHYSICAL REVIEW. B, CONDENSED MATTER 1995; 51:8996-9004. [PMID: 9977538 DOI: 10.1103/physrevb.51.8996] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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